import java.util.*;
public class Example3_9 {
    public static void main (String args[]) {
        Scanner reader = new Scanner(System.in);
        double sum=0;
        int m=0;
        while(reader.hasNextDouble()){
            double x = reader.nextDouble();
            m = m+1;
            sum = sum+x;
        }
        System.out.printf("%d个数的和为%f\n",m,sum);
        System.out.printf("%d个数的平均值是%f\n",m,sum/m);
    }
}
